Annotation of prex-old/boot/common/main.c, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 2005-2006, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * main.c - Prex boot loader main module
! 32: */
! 33:
! 34: #include <prex/bootinfo.h>
! 35: #include <platform.h>
! 36: #include <boot.h>
! 37: #include <ar.h>
! 38:
! 39: u_long load_base; /* current load address */
! 40: u_long load_start; /* start address for loading */
! 41: int nr_img; /* number of module images */
! 42:
! 43: struct boot_info *boot_info; /* pointer to boot information. */
! 44:
! 45: /*
! 46: * Define memory block as reserved area.
! 47: */
! 48: void
! 49: reserve_memory(u_long start, size_t size)
! 50: {
! 51: int i;
! 52: u_long mem_end;
! 53:
! 54: printk("reserve_memory: start=%x size=%x\n", start, size);
! 55:
! 56: if (boot_info->main_mem.size == 0)
! 57: panic("bad mem size");
! 58:
! 59: mem_end = boot_info->main_mem.start + boot_info->main_mem.size;
! 60: if (start > mem_end)
! 61: return;
! 62: if (start + size > mem_end)
! 63: size = mem_end - start;
! 64:
! 65: for (i = 0; i < NRESMEM; i++) {
! 66: if (boot_info->reserved[i].size == 0) {
! 67: boot_info->reserved[i].start = start;
! 68: boot_info->reserved[i].size = size;
! 69: break;
! 70: }
! 71: }
! 72: if (i == NRESMEM)
! 73: panic("No memory slot to reserve");
! 74: }
! 75:
! 76: /*
! 77: * Load all images.
! 78: * Return 0 on success, -1 on failure.
! 79: */
! 80: static int
! 81: load_image(struct ar_hdr *hdr, struct module *m)
! 82: {
! 83: char *c;
! 84:
! 85: if (strncmp((char *)&hdr->ar_fmag, ARFMAG, 2))
! 86: return -1;
! 87:
! 88: strncpy((char *)&m->name, (char *)&hdr->ar_name, 16);
! 89: c = (char *)&m->name;
! 90: while (*c != '/' && *c != ' ')
! 91: c++;
! 92: *c = '\0';
! 93: printk("load_image hdr=%x module=%x name=%s\n",
! 94: (int)hdr, (int)m, (char *)&m->name);
! 95: if (elf_load((char *)hdr + sizeof(struct ar_hdr), m))
! 96: panic("Load error");
! 97: return 0;
! 98: }
! 99:
! 100: #ifdef CONFIG_RAMDISK
! 101: /*
! 102: * Setup for RAMDISK
! 103: */
! 104: static void
! 105: setup_ramdisk(struct ar_hdr *hdr)
! 106: {
! 107: struct mem_map *ram_disk;
! 108: size_t size;
! 109:
! 110: if (strncmp((char *)&hdr->ar_fmag, ARFMAG, 2))
! 111: return;
! 112: size = (size_t)atol((char *)&hdr->ar_size);
! 113: if (size == 0)
! 114: return;
! 115:
! 116: ram_disk = (struct mem_map *)&boot_info->ram_disk;
! 117: ram_disk->start = (u_long)hdr + sizeof(struct ar_hdr);
! 118: ram_disk->size = size;
! 119:
! 120: reserve_memory(ram_disk->start, ram_disk->size);
! 121:
! 122: printk("RAM disk base=%x size=%x\n", ram_disk->start, ram_disk->size);
! 123: }
! 124: #endif /* CONFIG_RAMDISK */
! 125:
! 126: /*
! 127: * Setup OS images - kernel, driver and boot tasks.
! 128: *
! 129: * It reads each module file image and copy it to the appropriate
! 130: * memory area. The image is built as generic archive (.a) file.
! 131: *
! 132: * The image information is strored into the boot information area.
! 133: */
! 134: static void
! 135: setup_image(void)
! 136: {
! 137: char *hdr;
! 138: struct module *m;
! 139: char *magic;
! 140: int i;
! 141: long len;
! 142:
! 143: /*
! 144: * Validate archive image
! 145: */
! 146: magic = (char *)boot_info->archive;
! 147: if (strncmp(magic, ARMAG, 8))
! 148: panic("Invalid OS image");
! 149:
! 150: /*
! 151: * Load kernel image
! 152: */
! 153: hdr = (char *)((u_long)magic + 8);
! 154: if (load_image((struct ar_hdr *)hdr, &boot_info->kernel))
! 155: panic("Can not load kernel");
! 156:
! 157: /*
! 158: * Load driver module
! 159: */
! 160: len = atol((char *)&((struct ar_hdr *)hdr)->ar_size);
! 161: if (len == 0)
! 162: panic("Invalid OS image");
! 163: hdr = (char *)((u_long)hdr + sizeof(struct ar_hdr) + len);
! 164: if (load_image((struct ar_hdr *)hdr, &boot_info->driver))
! 165: panic("Can not load driver");
! 166:
! 167: /*
! 168: * Load boot tasks
! 169: */
! 170: i = 0;
! 171: m = (struct module *)&boot_info->tasks[0];
! 172: while (1) {
! 173: /* Proceed to next archive header */
! 174: len = atol((char *)&((struct ar_hdr *)hdr)->ar_size);
! 175: if (len == 0)
! 176: break;
! 177: hdr = (char *)((u_long)hdr + sizeof(struct ar_hdr) + len);
! 178:
! 179: /* Pad to even boundary */
! 180: hdr += ((u_long)hdr % 2);
! 181:
! 182: /* Check archive header */
! 183: if (strncmp((char *)&((struct ar_hdr *)hdr)->ar_fmag,
! 184: ARFMAG, 2))
! 185: break;
! 186:
! 187: #ifdef CONFIG_RAMDISK
! 188: /* Load RAM disk image */
! 189: if (!strncmp((char *)&((struct ar_hdr *)hdr)->ar_name,
! 190: "ramdisk.a", 9)) {
! 191: setup_ramdisk((struct ar_hdr *)hdr);
! 192: continue;
! 193: }
! 194: #endif /* CONFIG_RAMDISK */
! 195: /* Load task */
! 196: if (load_image((struct ar_hdr *)hdr, m))
! 197: break;
! 198: i++;
! 199: m++;
! 200: }
! 201:
! 202: boot_info->nr_tasks = i;
! 203:
! 204: if (boot_info->nr_tasks == 0)
! 205: panic("No boot task found!");
! 206:
! 207: /*
! 208: * Save information for boot modules.
! 209: * This includes kernel, driver, and boot tasks.
! 210: */
! 211: boot_info->modules.start = load_start;
! 212: boot_info->modules.size = (size_t)(load_base - load_start);
! 213: }
! 214:
! 215: #ifdef DEBUG_BOOT
! 216: static void
! 217: dump_image(struct module *m)
! 218: {
! 219: printk
! 220: ("%s: entry=%x phys=%x size=%x text=%x data=%x textsz=%x datasz=%x bss=%x\n",
! 221: m->name, (int)m->entry, (int)m->phys, (int)m->size,
! 222: (int)m->text, (int)m->data, (int)m->textsz,
! 223: (int)m->datasz, (int)m->bsssz);
! 224: }
! 225:
! 226: static void
! 227: dump_bootinfo(void)
! 228: {
! 229: struct module *m;
! 230: int i;
! 231:
! 232: printk("main memory start=%x size=%x\n",
! 233: (int)boot_info->main_mem.start,
! 234: (int)boot_info->main_mem.size);
! 235:
! 236: for (i = 0; i < NRESMEM; i++) {
! 237: if (boot_info->reserved[i].size != 0) {
! 238: printk("reserved mem start=%x size=%x\n",
! 239: (int)boot_info->reserved[i].start,
! 240: (int)boot_info->reserved[i].size);
! 241: }
! 242: }
! 243: printk("ramdisk start=%x size=%x\n",
! 244: (int)boot_info->ram_disk.start,
! 245: (int)boot_info->ram_disk.size);
! 246:
! 247: dump_image(&boot_info->kernel);
! 248: dump_image(&boot_info->driver);
! 249:
! 250: m = (struct module *)&boot_info->tasks[0];
! 251: for (i = 0; i < boot_info->nr_tasks; i++, m++)
! 252: dump_image(m);
! 253: }
! 254: #endif
! 255:
! 256: /*
! 257: * C entry point
! 258: */
! 259: void
! 260: loader_main(void)
! 261: {
! 262: u_int kernel_entry;
! 263:
! 264: printk("Prex Boot Loader V1.00\n");
! 265:
! 266: load_base = 0;
! 267: load_start = 0;
! 268: nr_img = 0;
! 269:
! 270: setup_bootinfo(&boot_info);
! 271: setup_image();
! 272: #ifdef DEBUG_BOOT
! 273: dump_bootinfo();
! 274: #endif
! 275: kernel_entry = (unsigned int)phys_to_virt(boot_info->kernel.entry);
! 276: printk("kernel_entry=%x\n", kernel_entry);
! 277: printk("Entering kernel...\n\n");
! 278: start_kernel(kernel_entry, (unsigned int)boot_info);
! 279: }
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